Getting a value of a specific key

Question

I'm a getting a string like this from database.

[{"Key":"a","Value":"4521"},{"Key":"b","Value":"7"}]

I want to get the value of the key "b" . What is the optimal way to do that in Go?

What have you tried so far? Are you just trying to parse that string as JSON? If not, can you post how you're accessing your database? — kingkupps, Jan 08 '21 at 04:04
@kingkupps I'm just trying to parse the string and access the value of the key "b" — Hash934, Jan 08 '21 at 04:21
@Hash934 this looks like a **json** string, Are you sure all strings you will gate will have exactly *same format*? — Oleg Butuzov, Jan 08 '21 at 04:28

score 3 · Accepted Answer · answered Jan 08 '21 at 04:34

package main

import (
    "encoding/json"
    "fmt"
    "log"
)

func main() {
    str := `[{"Key":"a","Value":"4521"},{"Key":"b","Value":"7"}]`

    // declaring out struct we will use for unmarshaling and iteration check.
    out := []struct {
        Key, Value string
    }{}

    if err := json.Unmarshal([]byte(str), &out); err != nil {
        log.Fatal(err)
    } else {
        // searching for value.
        for i := range out {
            if out[i].Key == "b" {
                fmt.Println("Found", out[i].Value)
                return
            }
        }
    }
}

This is an easy way to do that, not optimal. Optimal wound be parse string manually, byte by byte.

Oleg, This Works fine . Thanks a lot – Hash934 Jan 08 '21 at 04:46 — Hash934, Jan 08 '21 at 04:46

Getting a value of a specific key

1 Answers1